/* eslint-disable */
// 导出页面为PDF格式
// import html2Canvas from 'html2canvas';
// import JsPDF from 'jspdf';
// export default {
//   install(Vue, options) {
//     Vue.prototype.getPdf = function(title) {
//       var title = this.htmlTitle;
//       var element = document.querySelector('#pdfDom'); // 这个dom元素是要导出pdf的div容器

//       setTimeout(() => {
//         html2Canvas(element).then(function(canvas) {
//             canvas.getContext("2d").scale(2, 2);
//           var contentWidth = canvas.width ;
//           var contentHeight = canvas.height ;
//           //一页pdf显示html页面生成的canvas高度;
//           var pageHeight = (contentWidth / 592.28) * 841.89;
//           //未生成pdf的html页面高度
//           var leftHeight = contentHeight;
//           //页面偏移
//           var position = 0;
//           //a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
//           var imgWidth = 595.28;
//           var imgHeight = (592.28 / contentWidth) * contentHeight;
//           var pageData = canvas.toDataURL('image/jpeg', 1.0);
//           var pdf = new JsPDF('', 'pt', 'a4');
//           //有两个高度需要区分，一个是html页面的实际高度，和生成pdf的页面高度(841.89)
//           //当内容未超过pdf一页显示的范围，无需分页
//           if (leftHeight < pageHeight) {
//             pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
//           } else {
//             while (leftHeight > 0) {
//               pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
//               leftHeight -= pageHeight;
//               position -= 841.89;
//               //避免添加空白页
//               if (leftHeight > 0) {
//                 pdf.addPage();
//               }
//             }
//           }
//           pdf.save(title + '.pdf');
//         });
//       }, 0);
//     };
//   }
// };

// 导出页面为PDF格式
import html2Canvas from "html2canvas";
import JsPDF from "jspdf";
import { Loading } from 'element-ui';
export default {
  install(Vue, options) {
    Vue.prototype.getPdf = function (dom, title) {
      let loadingInstance = Loading.service({
          text:" ",
          background:"rgba(0, 0, 0, 0.7)",
          spinner:" "
        });
      var title = title;
      var c = document.createElement("canvas");
      var opts = {
        scale: 3,
        canvas: c,
        logging: true,
        width: document.querySelector(dom).offsetWidth,
        height: document.querySelector(dom).offsetHeight,
      };
      c.width = document.querySelector(dom).offsetWidth * 3;
      c.height = document.querySelector(dom).offsetHeight * 3;
      c.getContext("2d").scale(1, 1);
      html2Canvas(document.querySelector(dom), opts).then(function (canvas) {
        let contentWidth = canvas.width;
        let contentHeight = canvas.height;
        let pageHeight = (contentWidth / 592.28) * 841.89;
        let leftHeight = contentHeight;
        let position = 0;
        let imgWidth = 595.28;
        let imgHeight = (592.28 / contentWidth) * contentHeight;
        let pageData = canvas.toDataURL("image/jpeg", 1.0);
        let pdf = new JsPDF("", "pt", "a4");
        if (leftHeight < pageHeight) {
          pdf.addImage(pageData, "JPEG", 0, 0, imgWidth, imgHeight);
        } else {
          while (leftHeight > 0) {
            pdf.addImage(pageData, "JPEG", 0, position, imgWidth, imgHeight);
            leftHeight -= pageHeight;
            position -= 841.89;
            if (leftHeight > 0) {
              pdf.addPage();
            }
          }
        }
        pdf.save(title + ".pdf");
      
        setTimeout(()=>{
            loadingInstance.close();
        },4400) 
         
      });
    };
  },
};
